Abstract
We have employed the method of shelving to measure Zeeman resonances of asingle trapped Ba+ ion in low magnetic fields, and have observed radio frequencytransitions with linewidths of 5 Hz, limited by magnetic-field noise. We have alsoobserved the shift in the Zeeman frequency when the ion is illuminated byoff-resonant light. A simultaneous measurement of such light shifts in two atomicstates of Ba+ will permit a precise determination of the ratio of transition matrixelements. Furthermore, using this method with an ion in a standing lightwave, aproposed parity nonconservation (PNC) measurement with Ba+ or Ra+could be realized. In this paper we review methods and the status of theseexperiments and discuss the remaining challenges of the PNC experiment.
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